<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
    <meta name="format-detection" content="telephone=no,email=no,date=no,address=no"/>
    <title>生命周期</title>
    <style>
        [v-cloak]{
            display:none;
        }
    </style>
</head>
<body>
<div id="app" v-cloak></div>
<script src="js/vue.js"></script>
<script>
    let App={
      template:`
        <div>
           {{name}} <button type="button" @click="name='李四'">改名</button>
            <div v-if="isShow">
                 <input type="text" ref="username" placeholder="请输入用户名">
            </div>
            <button type="button" @click="isShow=true">显示Input</button>
        </div>
      `,
        data(){
          return {
              name:"张三"
          }
        },
        //初始化之前
        beforeCreate(){
            console.log("beforeCreate");
        },
        //初始化完成（不能获取dom，一般用于获取ajax数据）
        created(){
          console.log("created");
        },
        //挂载之前
        beforeMount(){
          console.log("beforeMount");
        },
        //挂载完成之后（可以获取dom）
        mounted(){
          console.log("mounted");
        },
        //数据更新之前
        beforeUpdate(){
          console.log("beforeUpdate");
        },
        /*
       * 1、更新数据之后获取焦点
       * 2、动态获取dom的属性
       * 3、更新数据之后对dom进行操作
       * */
        updated(){
            console.log("updated");
            this.$refs["username"].focus();
            console.log(this.$refs["username"].getAttribute("type"));
        }

    };
    new Vue({
        el:"#app",
        template:`
                <App></App>
        `,
        components:{
            App
        }
    })
</script>
</body>
</html>
